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2. Cleveland Ironstone Formation - Wikipedia

   en.wikipedia.org/wiki/Cleveland_Ironstone_Formation

   On average the Cleveland Ironstone Formation comprises around 70% shale and 30% ironstone [9] though the latter occurs in the form of the six named seams of variable thickness. The ironstone is classed as being low-grade with an iron-content of up to 33%, and is deemed economically viable only above ~27%.

3. Ironstone mining in Cleveland and North Yorkshire - Wikipedia

   en.wikipedia.org/wiki/Ironstone_mining_in...

   The list covers all the ironstone mines in the Cleveland Ironstone Formation and as such extends into parts of North Yorkshire that were not traditionally designated as being in Cleveland. [note 2] The list only covers areas of productive ironstone mining, and so does not include test areas (ie Goldsborough on the North Yorkshire coast where ...

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5. M. A. Hanna Company - Wikipedia

   en.wikipedia.org/wiki/M._A._Hanna_Company

   The origin of the M. A. Hanna Co. is the Rhodes & Company, founded in the 1840s by Daniel F. Rhodes to mine coal in the Mahoning Valley of Ohio. Mark Hanna, a Republican political figure in Ohio, married into the Rhodes family in 1864.

6. George Worthington (businessman) - Wikipedia

   en.wikipedia.org/wiki/George_Worthington...

   Steel plate engraving of George Worthington c. 1860. George Worthington (September 21, 1813 – November 9, 1871) was a 19th-century merchant and banker in Cleveland, Ohio, who founded the Geo. Worthington Company, a wholesale hardware and industrial distribution firm, in 1829 (until 1991 Cleveland's oldest extant business), as well as numerous banking and mining concerns, and contributed to ...

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